Add Tel, Number, Date, Time And Custom Input Types

[FabienHenon]

Let people create input fields with more types

Fix #286.

[Edward-Lombe]

Would love to see this merged, having a date input is something that I have sorely missed from elm-mdl

[aforemny]

Unfortunately this will note make it into v8, rather it will be in v9 (#335).

[drager]

@aforemny, @debois: Any reason why this isn't merged yet?

[aforemny]

@drager With upstream support having ended, unfortunately I do not find the time to work on this after all.

[rande]

@aforemny I don't see why the upstream support end should avoid merging this PR. Of course, time is a pretty good reason ;)

Does that mean the project will no longer accept any features ?

[blurpis]

This is the kind of obstruction I've come to expect in open source projects.